Air inlet for internal combustion motors



Oct. 16, 1934; M Y 1,977,518

AIR INLET FOR INTERNAL COMBUSTION MOTORS Filed June 1 4'. 19 3s Patented@ct. 116, Edg

iyuai lhtillhiilltl A1113, HNLIET Mild CEMEBNUSTIMN I/JIQ'JIGUJRS Thisinvention relates to a device for aitting air to the manifold of aninternal combustion motor, and particularly to means for automaticallycontrolling such admission in response to certain operating conditions.In driving the usual automobile, whenever the throttle is closed toreduce the speed of travel, either with or with out the application ofthe brakes, the continued operation of the motor driven by its ownmomen- W tum, and also by the momentum of the automobile if freewheeling is not used, creates a comparatively high vacuum in themanifold. This sucks in considerable gasoline through the idling well,and also oil from the crank case, without 6 sumcient air for completecombustion. Thus, gasoline and oil are wasted and an excessive amount ofcarbon monoxide is emitted from the exhaust.

The object of the present invention is to imfiil prove upon theabove-mentioned condition by supplying auxiliary air to the manifoldunder the conditions stated. It is, therefore, expedient to provideinertia controlled means for opening the auxiliary air valve, but at thesame time the 3d auxiliary air valve should be positively prevented fromopening, whenever the throttle valve is open.

My invention and the advantages resulting therefrom will be moreparticularly explained in connection with the accompanying drawing, in3b which Figure 1 is a sectional View of the invention as applied to theintake manifold; Fig. 2 is a similar View of a. modified form of theinvention; Fig. 3 is a fragmentary view of a mercury switch which 35 maybe used in place of the inertia controlled switch shown in Fig. 2.

As illustrated in the drawing, the invention is associated with amanifold 5 having an intake passageway 6 within which is a throttlevalve 7 40 having an arm 8 connected to a throttle control rod 9. An airinlet nipple 1.0 is connected to the intake passageway 6. The outer endof the nipple 10 is connected with a valve housing 11, pref erably inthe form of a cylinder, within which is a piston valve 12 normallyclosing a port 13, which leads to the nipple 10 and thence to the intakepassageway 6. The lower end of the housing 11 has an annular head 14with a comparatively large opening 15, which isnormlly covered 60 by thepiston valve 12, the latter being held against its seat by a spring 16.A passageway 17 leads from the upper end of the housing 11 into themanifold 5 at a point remote from the point at which the nipple 10 isconnected to the intake 55 passageway 6. The interior of the housing 11is provided with a circumferential channel 13 ad jacent the port 13, sothat the suction from the intake passageway 6 will not cause the valve12 to freeze to the wall of the cylindrical housing 11. As shown in l,the passageway 17 between the upper end of the housing 11 and themanifold 5, is normally closed by a transversely disposed valve 13. Thebifurcated outer end of this valve 19 has a suitable connection 20 witha pendant or pendulum 21 which is pivotally supported at 22 from anextension of the housing 11, and has at its lower end a weight or bob23, which is adapted to move forwardly by its own inertia whenever thecar, travelling in the direction of the arrow in Fig. 1, is decelerated.As the. hob or weight 23 thus moves forwardly, the valve 19 is shifteduntil the reduced portion 24 thereof registers with the passageway 17and places the interior of the valve housing 11 in co itll unic'ationwith the manifold 5. At this time, if the throttle 7 is closed, r553 thevacuum created in the manifold 5 will raise the piston valve 12,uncovering the port 13, so that auxiliary air will be admitted throughthe port 15 and nipple 10 to the intake passageway 6. The bob 23 may beprovided with an adjustable stop 25 to limit its forward movement. Ifthe car should be on a down grade, it isapparent that therewill be atendency for the bob 23 to move forwardly under the influence of gravityto open the valve 19. In order that there may be no difi'lculty instarting or accelerating the motor under such conditions, a lever 26 isfulcrumed at 27 on the housing 11 and is connected to the throttle rod9. The upper end 28 of this lever is in such a position that the openingof the throttle will cause itto kick the bob 23 rearwardly andpositively close the valve 19, so that the valve 12 will remain closedand no auxiliary air will be admitted to the manifold. 95 In themodification in Fig. 2, the valve 29, when seated, closes the passageway17 and is normally held to its seat by a spring 30. The opening movementof this valve is effected by a solenoid 31 when the latter is energizedand the possible opening. movement of the valve is limited by anadjustable screw 32. The energization of the solenoid 31 is controlledby a pendulum 33, similar to the penbit ' dulum 21, and provided with aswitch 34 which is closed by the inertia when the car is decelerated.There is also a switch 35 in the solenoid circuit, the contact points 36of the switch being urged toward open position by a spring 37. Thethrottle rod 9, however, is provided with a shoulder 38 which engages afinger 39 on the switch to posi- 1m tively close the latter when thethrottle 7 is closed. When the car is being decelerated, therefore, withthe throttle closed, a circuit is established from the battery 40through wire 41 to the solenoid 31, thence through wire 42, switch 35,wire 43 and switch 34 to the grounded side of the battery. It will beunderstood, of course, that the solenoid circuit is connected to thewiring system at the negative side of the ignition switch.

As illustrated in Fig. 3, a mercury switch 44 may be substituted for thependulum 33, one side of this switch being grounded, as shown at 45, andthe other side being connected by a wire 46 to the solenoid circuit.

From the foregoing description, it will be seen that the inventionprovides inertia controlled means for admitting auxiliary air to theintake manifold whenever the car is being decelerated with the throttleclosed. Means connected with the throttle rod, however, positivelyprevents the admission of such auxiliary air when the throttle is open,even though the car is on a down grade.

While I have shown and described various means of effecting the desiredresults, it is to be understood that these are merely for the purpose ofillustration and that the invention includes all such othermodifications as may fall within the scope of the appended claims.

What is claimed is:

1. The combination with an automobile motor having an intake manifoldwith an air inlet port and a valve normally closing said port butadapted to be opened by suction from said manifold induced by apredetermined degree of vacuum therein, of inertia controlled means forrendering said suction ineffective unless the speed of travel isdecreasing.

2. The combination with an automobile motor having an intake manifoldwith an air inlet port and a valve normally closing said port butadapted to be opened by suction from said manifold induced by apredetermined degree of vacuum therein, of a second valve normally in aposition to.cut off the first mentioned valve from the influence of thesuction which tends to open it, inertia controlled means to move thesecond valve from its normal position to subject the first mentionedvalve to such influence when the speed of travel is decreasing, andmeans operable in conjunction with the throttle valve of the motor tohold said second valve positively closed whenever the throttle valve isopen.

, 3. The combination with an automobile motor having an intake manifoldwith an air inlet port and a second port at a. distance therefrom, and avalve normally covering said air inlet port but operable by suctionthrough the second port to admit atmospheric air to the air inlet port,of a second valve normally closing communication between the second portand the first mentioned valve, and inertia controlled meansautomatically operable to open said second valve only if the speed oftravel is decreasing.

4, The combination with an automobile motor having an intake manifold,of a valve chamber with two passageways leading therefrom into themanifold, said chamber having also an atmospheric port, a valve normallycovering said atmospheric port and operable by suction from the manifoldthrough one of said passageways to open communication from said port tothe second passageway, a second valve associated with the firstpassageway and normally closedlto cut off theflrst mentioned valve fromthe influence of suction in the manifold, and inertia controlled meansautomatically operable to open the second valve only if the speed oftravel is decreasing.

5. The combination with an automobile motor having an intake manifoldwith an air inlet port and a valve normally closing said port, of meansincluding a weighted pendant, normally responsive only to a decrease inthe traveling speed of the automobile, to render said valve subject tothe sub-atmospheric pressure of the manifold in a manner tending to openthe valve.

6. The combination with an automobile motor having a throttle, an intakemanifold with an air inlet port and a. valve normally closing said port,but adapted to be opened by suction from said manifold induced by apredetermined degree of vacuum therein, of inertia controlled means forrendering said suction efiective only when the throttle is closed andthe speed of travel is decreasing.

7. The combination with the intake manifold and throttle of anautomobile motor, of inertia controlled means to admit air to saidmanifold as the speed of travel is decreasing with the throttle closed,and means connected with the throttle to oppose forward movement of theinertia controlled means when the throttle is open. I

8. The combination with the intake manifold and throttle of anautomobile motor, of a weighted pendant, means actuated by a relativeforward movement of said pendant to admit air to said manifold, andmeans to positively prevent such relative forward movement when thethrottle is open.

9. The combination with an automobile motor having a throttle, an intakemanifold with an air inlet port and a valve normally closing said port,but adapted to be opened by suction from said manifold induced by apredetermined degree of vacuum therein, a second valve normally in aposition to cut off the first mentioned valve from the influence of thesuction which tends to open it, and inertia controlled means, operableonly when the throttle is closed to move the second valve from itsnormal position to subject the first mentioned valve to such influencewhen the speed of travel is decreasing.

10. The combination with an automobile motor having a throttle and anintake manifold with an air inlet port and a second port at a distancetherefrom, of a valve normally covering said air inlet port but operableby suction through the second port to admit atmospheric air to the airinlet port, a second valve normally closing communication between thesecond port and the first mentioned valve, inertia controlled meansautomatically operable to open said second valve when the speed oftravel is decreasing, and means to render the inertia controlled meansinoperative if q the throttle is open.

11. The combination with an automobile motor having a throttle and anintake manifold, of a. valve chamber with two passageways leadingtherefrom into the manifold, said chamber having also an atmosphericport, a valve normally covering said atmospheric port and operable bysuction from the manifold through one of said passageways to opencommunication from said port to the second passageway, a second valveassociated with 145 the first passageway and normally closed to cut offthe first mentioned valve from the influence of suction in the manifold,inertia controlled means automatically controlled to open the secondvalve only if the speed of travel is decreasing, and means 5 to renderthe inertia controlled meansinoperative if the throttle is open.

12. The combination with an automobile motor having a throttle and anintake manifold with an air inlet port and a valve normally closing saidport, of means including a weighted pendant, normally responsive to adecrease in the traveling Mil

